[Insight-users] regid transformation matrix

[Ruben Schilling]

Henry,

take another look at e.g. your row vectors: They are approx. (1,0,0),  
(0,1,0), (0,0,1), which is orthogonal. Remember, that you are working  
with floating point arithmetic on a real computer and ITK is not  
based on symbolical computations.

Regards
Ruben


Am 28.09.2007 um 18:11 schrieb Henry:

> Hi I am using "LandmarkInitializedMutualInformationRegistration" from
> InsightApplications-3.4.0 and I have one question about the
> transformation matrix from registration results: although I choose
> rigid transformation, the transformation matrix are not seemed to be
> orthogonal, for example:
> 0.999982 0.00137216 -0.00581659
> -0.00133902 0.999983 0.0056975
> 0.00582431 -0.00568961 0.999967
>
> I guess it is because affine transformation is used even for rigid
> registration? How to use rigid transformation instead?
>
> Thanks!
> Henry
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